Bicycle frame



FIG. 1 is a front perspective view of bicycle frame;

FIG. 2 is a rear perspective view thereof;

FIG. 3 is a side elevation view thereof with the opposite side being a mirror image;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a top plan view thereof. 

The ornamental design for a bicycle frame, as shown and described. 